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anisotropic filtering

Started by dpadam450 May 29, 2009 at 2:09 AM 3 replies 2.4k views

Original Post

May 29, 2009 at 2:09 AM

Here are my current texture parameters. What exactly do I need to keep or take out because none of the results are changing and look bad still. glGenTextures(1, &(this->GL_Texture_Index)); glBindTexture(GL_TEXTURE_2D, (this->GL_Texture_Index)); glTexParameteri(GL_TEXTURE_2D,GL_GENERATE_MIPMAP,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR); float largest_supported_anisotropy; glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &largest_supported_anisotropy); glTexParameteri(GL_TEXTURE_2D, GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, largest_supported_anisotropy);

dpadam450

May 29, 2009 at 2:15 AM

I forced it to 16x in the NVIDIA control panel, but when I do application controlled it doesn't work. Not sure what else other than setting the texture parameter there is to do.

i_luv_cplusplus

May 29, 2009 at 3:14 AM

Read the specs: http://www.opengl.org/documentation/specs/man_pages/hardcopy/GL/html/gl/texparameter.html

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR);

this should be:

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

and

glTexParameteri(GL_TEXTURE_2D,GL_GENERATE_MIPMAP,GL_LINEAR);

should be:

glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);

dpadam450

May 29, 2009 at 3:34 AM

That didnt work either, the GL_TRUE ended up not mattering because GL_LINEAR is a non-zero # and is converted to true.

The GL_LINEAR simply made it GL_LINEAR default (no mip-mapping, no anisotropic)

V-man

May 29, 2009 at 10:48 AM

I recommend glGetError. It helps to locate problems.
Here is the corrected code

glGenTextures(1, &(this->GL_Texture_Index));glBindTexture(GL_TEXTURE_2D, (this->GL_Texture_Index));glTexParameteri(GL_TEXTURE_2D,GL_GENERATE_MIPMAP,GL_TRUE);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);float largest_supported_anisotropy;glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &largest_supported_anisotropy);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_ANISOTROPY_EXT, largest_supported_anisotropy);

which is from the Wiki
http://www.opengl.org/wiki/Texture_Mapping

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